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Use center of the pixel when aligning undercurl 

Since `x` position in rect shader represents left side of the pixel we
should use the center of it when dealing with contiguous functions.
This commit is contained in:
Kirill Chibisov 2022-03-14 08:52:53 +03:00 committed by GitHub
parent 7312f33f67
commit 589c1e9c6b
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1 changed files with 7 additions and 4 deletions
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11
alacritty/res/rect.f.glsl
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@ -37,11 +37,14 @@ uniform float_t undercurlPosition;
color_t draw_undercurl(float_t x, float_t y) {
// We use `undercurlPosition` as an amplitude, since it's half of the descent
// value.
float_t undercurl = undercurlPosition / 2. * cos(x * 2. * PI / cellWidth)
+ undercurlPosition - 1.;
//
// The `x` represents the left bound of pixel we should add `1/2` to it, so
// we compute the undercurl position for the center of the pixel.
float_t undercurl = undercurlPosition / 2. * cos((x + 0.5) * 2.
* PI / cellWidth) + undercurlPosition - 1.;
float_t undercurlTop = undercurl + max((underlineThickness - 1.), 0.);
float_t undercurlBottom = undercurl - max((underlineThickness - 1.), 0.);
float_t undercurlTop = undercurl + max((underlineThickness - 1.), 0.) / 2.;
float_t undercurlBottom = undercurl - max((underlineThickness - 1.), 0.) / 2.;
// Compute resulted alpha based on distance from `gl_FragCoord.y` to the
// cosine curve.